Format

There are five qualifying races, consisting of ten laps each, that determine the starting grid.[11] However, driver's starting positions in the qualifying races are determined by normal two-lap qualifying sessions.[11] Caution laps in the qualifying races are not scored, and five trucks will transfer from each qualifying race.[11] After the five races, a total of 25 trucks will have qualified for the feature (the main event).[11] Another race, named the 'Last Chance Race', consists of 15 laps, and determines the lineup from position 26 to 29.[11] The final position on the grid is awarded to the most recent Camping World Truck Series champion, unless there is no beneficiary to that position. In that case, the fifth-place finisher in the 'Last Chance Race' is awarded the final starting position.[11] The main event, or feature, is 150 laps long, with three segments of 40, 50 and 60 laps.[11] During each break, drivers are allowed to make pit stops.

In 2014, the format was changed. Instead of lasting eight laps, the heat races will now consist of ten laps, with the top five teams failing to qualify for the Main Feature being awarded owners' points. Additionally, drivers are no longer required to pit.[12]

Following the abolition of the "all exempt" tour format in 2015, the last chance format changed. Only the top drivers advance to the feature from the Last Chance race, for a net of 27 cars. The remaining five trucks in the field will be filled by NASCAR's provisional starting regulations; trucks in the top four in owner points standings that have not qualified for the race, and then the most recent Truck Series driver champion not in the field if necessary, or if not, the fifth-place truck in owner points standings of those not qualified.[13]

Multiple Feature winners (teams)

Manufacturer wins

Tuesday Night Tailgate

The Tuesday Night Tailgate is the supporting event to the Mudsummer Classic featuring pre-race technical inspection for the Truck Series teams. From 2014 to 2015, the event included the Sunoco American Late Model Series. In 2016, the event will feature the Super DIRTcar Series Big Block Modifieds, which will return to Eldora for the first time since 2006.[56]